Converting wiring on HF to SI

I have a 89 HF, I plan on swapping, I was told that I would want to put a SI car harness? Not sure if thats what its called but all the wireing in the car over to SI wires. It sounds like a good idea to me. Easier to vire up for vtec and all those other features like power windows and locks and blah blah blah. So how would i go about doing this? Where could i pick up all the wires? any pointers or other ideas?

hf and si have the same exact harness. for vtec, you'll either have to buy a sub harness from some company, or wire your vtp and solenoid directly to the pin outs in the ecu, simple as pie. no need to swap your harness though.